Shape memory metal is an alloy that can take any shape at a lower temperature and then return to its original shape after heating. It has memory, that’s why we call it “memory metal.”
Memory metal bends a straight wire at a right angle (90°). Once loosened, it will return a little to form an angle greater than 90°. To straighten a bent wire, you must bend it more than 180° then loosen it, so that it can return to a straight line.
For example, the crystal structure of nickel-titanium alloy is different above 40℃ and below 40℃, but when the temperature changes around 40℃, the alloy shrinks or expands, causing a change in its morphology. . Here, 40°C is the “transformation temperature” of the nickel-titanium memory alloy. Different alloys have their own transformation temperatures.
The transformation temperature of the high tempered alloyrature mentioned above is very high. At high temperatures, it takes the shape of a spiral and is in a stable state. When it is forcibly straightened at room temperature, it is in an unstable state. Therefore, as long as it is heated to the transformation temperature, it immediately returns to its original stable spiral shape.
Detailed information:
The high temperature phase of shape memory alloys exhibits high structural symmetry, usually an ordered cubic structure. Below the Ms temperature, the high temperature phase with a single orientation transforms into martensitic variants with different orientations.
When this material is deformed to make components below the temperature Ms, the martensitic variants of the material which are disadvantageous in the direction of the stress ccontinue to decrease; those that are advantageous continue to grow; Eventually, it transforms into an element with a single orientation of ordered martensite.
If heated again above the As point, when this low symmetry monooriented martensite undergoes a reverse transformation, it will form the previous monooriented high temperature phase.
Corresponding to this reversible transformation of the microstructure, the macroscopic shape of the material at high temperature is restored. This is called one-way shape memory. When the memory element processed by a certain process is cooled below Ms, it can return to its shape at low temperature, which is called the bidirectional shape memory effect.
Baidu Encyclopedia - Memory Metal
How much does a flat solar panel usually weigh How long does it take to heat it?
Tools needed: board, pliers, screwdriver.
1. First use pliers to remove all power cords from outside of the water heater's heating rod.
2. Then unplug the connection wires around the water heater one by one.
3. Then use a screwdriver to remove the surrounding small screws.
4. Then use a wrench to unscrew the surrounding large screws.
5. Then the outer fixed cover can be removed.
6. Then you can remove the heating rod from the water heater.
Detailed information:
Thawing refers to the electric heating belt (also called anti-freeze belt), the choice of this heating belt is also very critical if the connection of the heating belt is. not good, it will cause electricity to be connected and burn the pipe insulation. This has happened several times in the market. You should also choose hot melt adhesive sealing technology and conductive copper core. should not be less than 0.2 mm. If the thickness is less than this, it will not meet the standard.
Let me answer the question above again. The weight of flat solar panels is mainly related to the maframe material used by the manufacturer during processing. 1 square meter weighs 25 kg. certainly no problem. We, Hailin Solar, use aluminum alloy rivetless frame. Each collector measures 2 square meters and weighs 34 kg. When filled with medium it weighs 36 kg, averaging 18 kg per square meter. a stable and durable structure. If you calculate the weight after installation, it depends on the installation method and the weight of auxiliary materials. The question you asked about heating rate is not easy to answer. Based on experience, flat plate collectors heat up faster than evacuated tube collectors with the same surface area!